How to export fills on Freestyle SVG export?
The SVG exporter only supports exporting the freestyle lines at the moment.
If you want to have the fill in your SVG file as well, you can use the trace bitmap function in inkscape (or a similar action in other vector graphics programs) on your rendered image.

This is a little bit beyond strict blender topics, but I don't think there's a way to do this without external programs.

http://i.giphy.com/l41lKvw47mA396Ei4.gif